胶州湾多溴联苯醚-153迁移转化的数值模拟研究  

Numerical simulation on the migration and transformation of polybrominated diphenyl ethers 153 in Jiaozhou bay

作　　者：丁晓坤 马得云 王奥博 DING Xiaokun;MA Deyun;WANG Aobo(School of Ocean,Yantai University,Yantai 264000,China;School of Hydraulic Engineering,Ludong University,Yantai 264000,China)

机构地区：[1]烟台大学海洋学院,山东烟台264000 [2]鲁东大学水利工程学院,山东烟台264000

出　　处：《海洋环境科学》2024年第4期572-580,590,共10页Marine Environmental Science

基　　金：烟台大学大学生创新创业训练计划(X202311066017);国家自然科学基金面上项目(41976013)。

摘　　要：多溴联苯醚对海洋生物生长甚至人体健康危害较大,然而,我国近海多溴联苯醚的迁移转化及调控机制尚不明确。本文利用数值模型定量分析了胶州湾多溴联苯醚-153(polybrominated diphenyl ethers 153,BDE-153)的季节性迁移转化过程。模拟结果表明:胶州湾BDE-153浓度的季节变化呈现明显的夏季单峰分布特征,溶解态和总颗粒态BDE-153的最高浓度分别为0.22μg/m^(3)和2.3μg/m^(3);浮游植物吸收、死亡以及碎屑矿化过程中的BDE-153转化速率同样在夏季明显高于其他季节。胶州湾BDE-153浓度及其在生化过程中的转化速率均呈自北向南带状衰减规律,尤其在西北角的大沽河和东北角的墨水河入海口附近数值最高。河流是胶州湾BDE-153的关键来源,其入海速率为10.5 kg/a,明显高于海气交换的补给速率。与外海的对流交换是胶州湾BDE-153的主要汇,溶解态和总悬浮颗粒态的输出速率分别为1.1 kg/a和8.0 kg/a。Polybrominated diphenyl ethers(PBDEs)pose significant threats to the growth of marine organisms and even human health.However,the migration,transformation,and regulatory mechanisms of PBDEs remain unclear in China's coastal waters.This study utilizes a numerical model to quantitatively analyze the seasonal migration and transformation of polybrominated diphenyl ethers 153(BDE-153)in Jiaozhou bay.The simulation results revealed that BDE-153 concentration exhibited apparent seasonal variation with a peak in summer,with the highest concentrations for dissolved and total particulate BDE-153 reaching 0.22μg/m^(3)and 2.3μg/m^(3),respectively.Transformation rates of BDE-153 during phytoplankton absorption,mortality,and debris mineralization were also significantly higher in summer than in other seasons.Both concentration of BDE-153 and its transformation rates during biotic processes showed a belt-shaped decrease from north to south with the highest values near the DaGu river in the northwest and the MoShui river in the northeast.Rivers were the key source of BDE-153,with an input flux of 10.5 kg/a,significantly higher than the supply rate from air-sea exchange.Convective exchange with the open sea was the primary sink with output rates of 1.1 kg/a and 8.0 kg/a for dissolved and total suspended particulate forms,respectively.

关 键 词：六溴联苯醚 季节变化 迁移转化 数值模拟 胶州湾 

分 类 号：X142[环境科学与工程—环境科学] X55